Note the red triangle appears when the "stroke under fill" option is selected. If the user mouses over this the tooltip can read something like: "Currently only supported by some browsers".
Thinking about this design I figure we could create a much nicer layout with:
https://inkscape.org/en/~doctormo/%E2%98%85paint-order-design
I've re-ordered the items here so they collate into a nice 3x3 grid. And attempted to reuse the style of the other icons.
I believe having three of the possible six as common buttons will be useful for a few reasons. 1. it allows us to iconify the option, so showing users unfamiliar with paint order what this means. 2. It cuts down on what would be really verbose drop-down or more complex ui element 3. It won't cause too much choice anxiety and 4. it looks aesthetic.
Martin,